-- @testpoint: opengauss关键字unusable(非保留)，作为函数名,部分测试点合理报错

--关键字不带引号-成功
drop function if exists unusable;
create function unusable(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists unusable;
--关键字带双引号-成功
drop function if exists "unusable";
create function "unusable"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function if exists "unusable";
--关键字带单引号-合理报错
drop function if exists 'unusable';
create function 'unusable'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `unusable`;
create function `unusable`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
